摘要
研究外源一氧化氮(NO)对5℃低温胁迫下龙眼幼苗生理特性的影响。结果表明:低温胁迫下,龙眼幼苗叶片中的SOD、POD和CAT活性降低,叶绿素、可溶性糖和蛋白质含量下降,丙二醛含量升高。喷施硝普钠(SNP、NO供体)显著提高龙眼幼苗的叶绿素、可溶性糖和蛋白质含量,提高净光合速率,增强SOD、POD和CAT活性,降低丙二醛含量和电解质渗透率;其中150μmol/L SNP处理效果最好。可见,外源NO通过刺激抗氧化酶活性来清除活性氧,减轻膜脂过氧化作用,缓解低温胁迫对龙眼幼苗的伤害作用,提高龙眼的抗低温胁迫能力。
The effects of sodium nitropprusside（SNP） as an exogenous nitric oxide donor at different concentrations on the physiological reaction of longan seedlings under low temperature（5 ℃） stress were studied. Under the stress of low temperature, superoxide dismutase（ SOD）, peroxidase（ POD）, and catalase（ CAT） activities as well as the total chlorophyll, soluble protein, and soluble sugar contents of the leaf decreased obviously, and the leaf malondialdedyde content had a remarkable increase. The SOD, POD, and CAT activities and the total chlorophyll,soluble protein, and soluble sugar contents were improved significantly after applying SNP, the malondialdedyde content was reduced. The best abating effect occurred with the SNP concentration 150 μmol/L. It was suggested that exogenous nitric oxides could alleviate the toxic effect of low temperature stress on longan seedlings via activating the seedlings leaf antioxidant enzyme activities and reducing oxidative stress,
出处
《热带作物学报》
CSCD
北大核心
2017年第9期1633-1637,共5页
Chinese Journal of Tropical Crops
基金
泉州市科技计划项目(No.2010N10)
关键词
一氧化氮
硝普钠
低温胁迫
龙眼
生理特性
Nitric oxide（NO）
sodium nitroprusside（SNP）
low temperature stress
Dimocarpus longana cv
Fuyan
physiological effects
